Replace asyncmock with mock 4.x

Codecov Report

Merging #657 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #657   +/-   ##
=======================================
  Coverage   86.22%   86.22%           
=======================================
  Files         183      183           
  Lines       13450    13450           
=======================================
  Hits        11597    11597           
  Misses       1853     1853

Impacted Files	Coverage Δ
...uments/tests/consumers/test_ml_results_consumer.py	100% <100%> (ø)
arkindex/himanis/tests/test_acts_importer.py	100% <100%> (ø)
...index/documents/tests/test_transcription_create.py	100% <100%> (ø)
arkindex/documents/tests/test_corpus.py	100% <100%> (ø)
arkindex/documents/tests/test_pagexml.py	100% <100%> (ø)
arkindex/images/tests/test_perform_check.py	100% <100%> (ø)
arkindex/documents/tests/test_ml_results.py	100% <100%> (ø)
arkindex/documents/tests/test_admin_api.py	100% <100%> (ø)

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added 3 commits

• 2b6bdc91...1d74a651 - 2 commits from branch master
• b73b8fd3 - Replace asyncmock with mock 4.x

Compare with previous version

enabled an automatic merge when the pipeline for b73b8fd3 succeeds

mentioned in commit 5b574f5a

merged